Seagate Slim 500GB Portable Hard Drive USB 3.0 (STCD500100) Ultra-thin portable hard drive, perfect for on-the-go Use the Protect function for a one-click back up or customize a back up schedule Save feature enables user-generated content to be backed up from your favorite social network Share feature allows multiple files to be uploaded to social networks at once from your computer Install pre-loaded NTFS driver for Mac and make your drive interchangeable between PC's and Mac's without reformatting USB 3.0 for ultra-fast transfer speeds (USB 2.0 backward compatible)